Note 8 - Assets Held for Sale, Asset Sales and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Beginning balance	0	8
Additions			3
Ending balance	0	0	8
Vessels Held for Sale [Member]
Beginning balance	0	8	18
Beginning balance	$ 0	$ 4,195	$ 14,421
Additions	0	0	3
Additions	$ 0	$ 0	$ 2,561
Sales	0	(8)	(12)
Sales	$ 0	$ (4,195)	$ (11,287)
Reactivation	0	0	(1)
Reactivation	$ 0	$ 0	$ (1,500)
Ending balance	0	0	8
Ending balance	$ 0	$ 0	$ 4,195